72069157 has 4 divisors (see below), whose sum is σ = 72812236. Its totient is φ = 71326080.

The previous prime is 72069139. The next prime is 72069163. The reversal of 72069157 is 75196027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9326916 + 62742241 = 3054^2 + 7921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72069157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72069167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371394 + ... + 371587.

It is an arithmetic number, because the mean of its divisors is an integer number (18203059).

Almost surely, 2^72069157 is an apocalyptic number.

It is an amenable number.

72069157 is a deficient number, since it is larger than the sum of its proper divisors (743079).

72069157 is an equidigital number, since it uses as much as digits as its factorization.

72069157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743078.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 72069157 is about 8489.3555114626. The cubic root of 72069157 is about 416.1499186142.

The spelling of 72069157 in words is "seventy-two million, sixty-nine thousand, one hundred fifty-seven".